This is mostly encountered for bounds of automatic arrays. The following is
invalid, but accepted by most compilers:
subroutine foo(x,n)
implicit none
real :: x(n)
integer :: n
It is also accepted by gfortran (unless -std=f2008 etc. is used). However,
currently gfortran (since 4.4 / since PR 32095 / PR 34228) unconditionally
rejects code of the kind:
subroutine foo(x,n)
implicit none
real :: x(n+1) ! expression: "variable + constant"
integer :: n
with the message "Symbol '%s' is used before it is typed at %L". While this is
useful to prevent circular usage (cf. PR 32095) simple EXPR_OP as above, esp.
those which only involve +-*/ could be allowed. (They occure in real-world
code.)
--
Summary: Relax "Symbol is used before it is typed" checking
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37688
